K3S HI SIGNAL
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What does tip to tip mean - pointing 90 degrees apart?
Don't you use verticals for your mult stations at W3LPL to minimize in band interference? How far are they from the Yagis? John KK9A Frank Donovanf W3LPL wrote: We routinely operate three or more K3 transceivers on the same band at W3AO, four on the band our GOTA station is operating. Not only is there no damage to the K3s and no HI SIG warnings, we don't hear any cross-station interference at all! The trick is to use horizontally polarized antennas installed tip-to-tip with at least 100 feet of spacing between each other. 73 Frank W3LPL ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Hi John,
No, they are all pointed in exactly the same direction. To eliminate all interference between multiple K3 transceivers operating in the same band, all W3AO HF antennas are deployed in a 10 00 foot long straight line running north-south with all of our 3 element HF Yagis and 2 element 40 meter Yagis pointed west. All of our dipoles are broadside east-west. There's no trace of interference among any of the K3 transceivers 73 Frank W3LPL ----- Original Message ----- From: [hidden email] To: [hidden email] Sent: Monday, June 25, 2018 5:34:37 PM Subject: [Elecraft] K3S HI SIGNAL What does tip to tip mean - pointing 90 degrees apart? Don't you use verticals for your mult stations at W3LPL to minimize in band interference? How far are they from the Yagis? John KK9A Frank Donovanf W3LPL wrote: We routinely operate three or more K3 transceivers on the same band at W3AO, four on the band our GOTA station is operating. Not only is there no damage to the K3s and no HI SIG warnings, we don't hear any cross-station interference at all! The trick is to use horizontally polarized antennas installed tip-to-tip with at least 100 feet of spacing between each other. 73 Frank W3LPL ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Note that Frank's reply was to a FD (W3AO) setup question.
Frank's W3LPL station has a much different matrix of antennas. 73 jim ab3cv On Mon, Jun 25, 2018 at 2:31 PM <[hidden email]> wrote: > Hi John, > > > No, they are all pointed in exactly the same direction. > > > > To eliminate all interference between multiple K3 transceivers > operating in the same band, all W3AO HF antennas are deployed in > a 10 00 foot long straight line running north-south with all of our > 3 element HF Yagis and 2 element 40 meter Yagis pointed west. > All of our dipoles are broadside east-west. > > > There's no trace of interference among any of the K3 transceivers > > > 73 > Frank > W3LPL > > ----- Original Message ----- > > From: [hidden email] > To: [hidden email] > Sent: Monday, June 25, 2018 5:34:37 PM > Subject: [Elecraft] K3S HI SIGNAL > > What does tip to tip mean - pointing 90 degrees apart? > > Don't you use verticals for your mult stations at W3LPL to minimize in > band interference? How far are they from the Yagis? > > John KK9A > > > Frank Donovanf W3LPL wrote: > > We routinely operate three or more K3 transceivers on the same band > at W3AO, four on the band our GOTA station is operating. Not only > is there no damage to the K3s and no HI SIG warnings, we don't hear > any cross-station interference at all! > > > The trick is to use horizontally polarized antennas installed tip-to-tip > with at least 100 feet of spacing between each other. > > > 73 > Frank > W3LPL > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by donovanf
Hi John,
I forgot to answer your question about the receiving antennas at my W3LPL multi-multi contest station. T hey're all verticals. 36 of them located one 1000 feet south east of my transmitting antennas. Three 8-circle vertical arrays for 160, 80 and 40 meters and Three 4-square vertical arrays for 20, 15 and 10 meters. 73 Frank W3LPL ----- Original Message ----- From: [hidden email] To: [hidden email] Cc: [hidden email] Sent: Monday, June 25, 2018 6:29:03 PM Subject: Re: [Elecraft] K3S HI SIGNAL Hi John, No, they are all pointed in exactly the same direction. To eliminate all interference between multiple K3 transceivers operating in the same band, all W3AO HF antennas are deployed in a 1000 foot long straight line running north-south with all of our 3 element HF Yagis and 2 element 40 meter Yagis pointed west. All of our dipoles are broadside east-west. There's no trace of interference among any of the K3 transceivers 73 Frank W3LPL ----- Original Message ----- From: [hidden email] To: [hidden email] Sent: Monday, June 25, 2018 5:34:37 PM Subject: [Elecraft] K3S HI SIGNAL What does tip to tip mean - pointing 90 degrees apart? Don't you use verticals for your mult stations at W3LPL to minimize in band interference? How far are they from the Yagis? John KK9A Frank Donovanf W3LPL wrote: We routinely operate three or more K3 transceivers on the same band at W3AO, four on the band our GOTA station is operating. Not only is there no damage to the K3s and no HI SIG warnings, we don't hear any cross-station interference at all! The trick is to use horizontally polarized antennas installed tip-to-tip with at least 100 feet of spacing between each other. 73 Frank W3LPL ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by donovanf
On 6/25/2018 11:29 AM, [hidden email] wrote:
> No, they are all pointed in exactly the same direction. Right. The concept is to make them "colinear," so each antenna is in the other's null (off the end). We have done exactly that for our CQP county expeditions, where we run K3/KPA500 stations on the same band. Running 7 dB more power requires at least double the separation. Another important component is an effective ferrite choke at each antenna's feedpoint -- that can improve isolation by preventing feedline radiation/reception from filling in the nulls. Careful planning of antenna setup is key to a successful multi-transmitter setup. Since we're on the left coast, we do the same thing you do - Yagis pointed to W2/W3, dipoles broadside in the same direction. Operating from the middle of the country, dipoles are a better choice than Yagis, especially for CW, again oriented broadside E/W. We do QRP FD, CW only, and it's obvious that some stations have paid a lot more attention to RX noise than others. Our club's call is W6BX, and we worked W3AO on at least three bands. Don't know if we made it on 80 -- haven't looked at the log. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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